Question about Dewalt 3800 PSI Pressure Washer

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Dewalt 3800 PSI operates great until gas tank is half full then cuts off. Can not pull cord until all pressure is released and hose disconnected. Will start again but will not stay on for more then a few minutes.

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When you pull to start squeeze the water hose tigger until start.

Posted on Oct 03, 2010

  • Doctor PC
    Doctor PC Oct 05, 2010

    Also i forgot ;change the spark plug

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  • 5 Answers

It's the gas cap. It won't vent and let air in the tank so the carb can't get enough fuel. Crack the cap open a little to let some air in and run it like that or buy a new different cap that will let it breathe.

Posted on Jan 22, 2015

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1 Answer

The engine runs but the water will not come out under pressure


You must have blown out the cones (thats how the water gets compressed inside of pump) in the water pump-

You could try this though on the back of the washer right on top of the water pump is a black knob about the size of your hand that knob will adjust the pressure try turning it and see although I doubt that is the problem-

A pressure washer is not like a compressor you HAVE to pull the trigger every minute NEVER let it just sit there running without pulling the trigger to release the pressure that Dewalt 3800 psi washer you have is a great machine in fact we own 4 of them and they are pretty powerful and easy to damage if left running alone.

TY,

Perry Tradesman

Sep 05, 2014 | Dewalt 3800 PSI Pressure Washer

2 Answers

Dewalt 3800 psi


You checked the output to measure 5 GPM? How are you feeding that unit? What are you using for detergent? Have you adjusted the bypass valve?

May 04, 2013 | Dewalt 3800 PSI Pressure Washer

1 Answer

Dewalt compressor builts pressure but doesn't supply hose and tool with the air


Dewalt sells a rebuild kit for the regulator (my be part # N008792). You could try lubing the internal parts before ordering the kit. With no air in the tank, remove the plastic knob assembly and pull out the small piston. In the center of the valve body will be a small brass plunger. You should be able to push this plunger in with thumb pressure. If stuck, remove the nut on the back of the valve and lube the plunger with grease (pull the plunger off the back-nut if stuck in place). Lube the piston and cylinder (black plastic piece) with grease and reinstall. The small piston has a lip seal that should point toward the body of the manafold. For emergency air, remove the safety pop-valve and install a tee fitting. On this tee fitting reinstall the safety valve on one port and a quick disconnect on the other. You can draw air out of the tank at full pressure untill you repair the regulator. Good luck

Mar 29, 2013 | Dewalt D55141 Heavy Duty 2 Gal, 150 Psi...

1 Answer

Dewalt DPD3800 pressure washer starts and runs fine. After 5-10 minutes of washing the engine quits. It will not start until it cools. The engine will start after a 10 minute cool down. It will run and...


I have the exact same pressure washer and have had the same issues with it. The cure for me was to simply run the washer with the gas cap loose. For some reason the fuel gets vacuume locked and stops flowing into the carb. The fuller the tank is it seems the shorter the time is between the time it starts and the time it shuts off. Or you might find a way to vent the cap. Hope this helps.

Jun 06, 2011 | Dewalt 3800 PSI Pressure Washer

1 Answer

Dewalt air compressor keeps running until pressure output is 200 PSI, the same pressure in the tank. Why doesn't it quit running at 120 PSI the designated pressure on the compressor?


The regulator switch/unloader is bad or out of adjustment. Perhaps though the gauge is faulty. 200 psi in a 120psi compressor is dangerous, don't run it until it is fixed!

Dec 15, 2010 | Dewalt Air Tools & Compressors

1 Answer

Dewalt Pressure washer keeps shutting off for no reason. plenty of gas and oil, water running to it. starts fine and as soon as I start spraying it shuts down.


Had a similar issue with my dewalt 4200 pw. Unit starting shutting off after spraying for about 5 min. Then difficult to restart, but would start again eventually only to shut down a few min later. Had new engine oil, new pump oil, good gas. I changed the spark plug and unit runs great again!

Aug 08, 2010 | Dewalt 3800 PSI Pressure Washer

1 Answer

Low pressure


hi some valves at cat pumps need a 100 psi pressure to open and close correct. when there is air in the pump the valves wil not open and close till air is bleeded. take of highpressure hose, open watertap and bleed pump till no more air comes out. reconnect all hoses and try again. if there is no more air in the pump and its still not working, i should think its the pump.

Jan 31, 2010 | Dewalt 3800 PSI Pressure Washer

5 Answers

John Deere 3300 PSi pressure washer shutting off while in use.Everything appears fine Oil level,Gal level,Air cleaner ok etc.. May run 2 minutes or 12 minutes then spudders a bit then Bang "Off" as if i...


John Deere will replace the cap for free; they acknowledge the vendor who supplied Briggs & Stratton gas caps provided faulty caps. Call 1-888-228-3068 then 1 (English), 2, 1 and a technician will ask you for model number and Serial Number (which they need to replace the cap). Don't drill a hole in your cap: debris will find a way into the gas tank and end up possibly fouling the engine. Bob from NJ

Nov 03, 2009 | Dewalt 3800 PSI Pressure Washer

1 Answer

DeWalt 3800 Pressure Washer Runs 20 min then quits.


I have the same problem and even have the issue with gas cap off.

Sep 24, 2009 | Dewalt 3800 PSI Pressure Washer

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